pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-76951-21171_Barcarole_Sett_tune_4.ps) >>/Users/jc/w/tmp/Tune-76951-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/EliasHowe/MusiciansCompanionP2/21171_Barcarole_Sett_tune_4.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Tune-76951-21171_Barcarole_Sett_tune_4.abc 981 ABC music file with the extracted tune(s)
Tune-76951-21171_Barcarole_Sett_tune_4.ps 35761 PostScript
Tune-76951-21171_Barcarole_Sett_tune_4.txt 981 Plain-text file with the extracted tune(s)
Tune-76951-get.log 5034 Log file, useful mostly for debugging
These files should be available for 24 hours.